1. A virtual machine scheduling and secure access method is characterized by comprising the following steps:

configuring a security level identifier for a virtual machine, and acquiring an optional host list based on the operation index of the virtual machine;

traversing the selectable host list, and judging whether the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine one by one;

if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine or the host in the selectable host list has no security level identification and no running virtual machine exists on the host, scheduling the virtual machine to run on the host; and

and responding to a received user access system request, acquiring a security level identification corresponding to the user access authority, and providing a virtual machine and a host machine resource which are lower than the security level identification corresponding to the access authority for the user.

2. The virtual machine scheduling and secure access method of claim 1, wherein configuring the virtual machine with the security level identifier comprises:

and configuring a security level identifier according to the security degree of the virtual machine, wherein the security level identifier of the virtual machine is configured to be absent by default.

3. The virtual machine scheduling and secure access method of claim 1, wherein obtaining the optional host list based on the operation index of the virtual machine comprises:

screening optional hosts based on the operation indexes of the virtual machines, and generating an optional host list based on the optional hosts;

the operation indexes comprise a memory, a CPU, a storage and a network.

4. The virtual machine scheduling and secure access method of claim 1, wherein traversing the selectable host list further comprises:

setting a global cache variable based on a host identification and a security level identification corresponding to the host, and scheduling the virtual machine through the global cache variable.

5. The virtual machine scheduling and secure access method of claim 1, wherein determining whether the security class identifiers of the hosts in the selectable host list are consistent with the security class identifier of the virtual machine one by one comprises:

obtaining a security level identifier of a host in the selectable host list in a cache, if the security level identifier of the host does not exist in the cache, further obtaining a virtual machine which is operated on the host, and taking the security level identifier of the virtual machine which is operated on the host as the security level identifier of the host;

and judging whether the security level identification of the host is consistent with the security level identification of the virtual machine.

6. The method of claim 1, wherein if the security level id of the host in the selectable host list is consistent with the security level id of the virtual machine or if the host in the selectable host list has no security level id and there is no virtual machine running on the host, the scheduling the virtual machine to run on the host comprises:

if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine, the virtual machine is dispatched to the host to run;

if the host in the selectable host list has no security level identification and no running virtual machine exists on the host, setting the security level identification of the virtual machine as the security level identification of the host, and scheduling the virtual machine to the host to run.

7. The virtual machine scheduling and secure access method according to claim 1, wherein obtaining the security level identifier corresponding to the access right of the user, and providing the virtual machine and host resource lower than the security level identifier corresponding to the access right for the user further comprises:

and if the user access authority is not set with the security level identification, providing the virtual machine and host machine resources with the security level identification of no for the user.

8. A virtual machine scheduling and secure access apparatus, comprising:

the system comprises a first module, a second module and a third module, wherein the first module is configured to configure a security level identifier for a virtual machine and acquire an optional host list based on the operation index of the virtual machine;

the second module is configured to traverse the selectable host list and judge whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines one by one;

a third module, configured to schedule the virtual machine to run on the host if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no virtual machine runs on the host; and

and the fourth module is configured to respond to a received user access system request, acquire the security level identification corresponding to the user access authority, and provide the virtual machine and host machine resources lower than the security level identification corresponding to the access authority for the user.

9. A computer device, comprising:

at least one processor; and

a memory storing computer instructions executable on the processor, the instructions when executed by the processor implementing the steps of the method of any one of claims 1 to 7.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.

Background

With the continuous development and innovation of virtualization technology, more and more units and enterprises apply virtualization systems to manage servers, and some confidential enterprises, such as military industry, have high requirements on the secure access to virtual machines and host resources.

However, many existing virtualization systems do not solve such problems, for example, services and resources with different security levels are deployed in different virtual machines and hosts, and access control of the services and resources is performed through the security level identifiers, so as to achieve the security effect corresponding to the different security level identifiers.

Disclosure of Invention

In view of this, an object of the embodiments of the present invention is to provide a method, an apparatus, a device, and a readable medium for scheduling and accessing a virtual machine safely, in which a virtual machine is divided into different security identifiers, and is scheduled to a host corresponding to the security identifiers during startup or load balancing scheduling, so that the virtual machine with different security identifiers is physically divided and isolated, and access control of resources of the host and the virtual machine is further achieved through the security identifiers of the host and the virtual machine.

Based on the above purpose, an aspect of the embodiments of the present invention provides a virtual machine scheduling and secure access method, including the following steps: configuring a security level identifier for a virtual machine, and acquiring an optional host list based on the operation index of the virtual machine; traversing the selectable host list, and judging whether the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine one by one; if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine or the host in the selectable host list has no security level identification and no running virtual machine exists on the host, scheduling the virtual machine to run on the host; and responding to a received user access system request, acquiring the security level identification corresponding to the user access authority, and providing the virtual machine and host machine resources lower than the security level identification corresponding to the access authority for the user.

In some embodiments, configuring the virtual machine with the security class identification comprises: and configuring a security level identifier according to the security degree of the virtual machine, wherein the security level identifier of the virtual machine is configured to be absent by default.

In some embodiments, obtaining the list of optional hosts based on the performance metrics of the virtual machine comprises: screening optional hosts based on the operation indexes of the virtual machines, and generating an optional host list based on the optional hosts; the operation indexes comprise a memory, a CPU, a storage and a network.

In some embodiments, traversing the selectable host list further comprises: setting a global cache variable based on a host identification and a security level identification corresponding to the host, and scheduling the virtual machine through the global cache variable.

In some embodiments, determining, on an individual basis, whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines comprises: obtaining a security level identifier of a host in the selectable host list in a cache, if the security level identifier of the host does not exist in the cache, further obtaining a virtual machine which is operated on the host, and taking the security level identifier of the virtual machine which is operated on the host as the security level identifier of the host; and judging whether the security level identification of the host is consistent with the security level identification of the virtual machine.

In some embodiments, if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no virtual machine is running on the host, scheduling the virtual machine to run on the host comprises: if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine, the virtual machine is dispatched to the host to run; if the host in the selectable host list has no security level identification and no running virtual machine exists on the host, setting the security level identification of the virtual machine as the security level identification of the host, and scheduling the virtual machine to the host to run.

In some embodiments, obtaining the security level identifier corresponding to the access right of the user, and providing the virtual machine and host resource lower than the security level identifier corresponding to the access right for the user further includes: and if the user access authority is not set with the security level identification, providing the virtual machine and host machine resources with the security level identification of no for the user.

In another aspect of the embodiments of the present invention, a virtual machine scheduling and security access apparatus is further provided, including: the system comprises a first module, a second module and a third module, wherein the first module is configured to configure a security level identifier for a virtual machine and acquire an optional host list based on the operation index of the virtual machine; the second module is configured to traverse the selectable host list and judge whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines one by one; a third module, configured to schedule the virtual machine to run on the host if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no virtual machine runs on the host; and the fourth module is configured to respond to a received user access system request, acquire the security level identification corresponding to the user access authority, and provide the virtual machine and host machine resources lower than the security level identification corresponding to the access authority for the user.

In another aspect of the embodiments of the present invention, there is also provided a computer device, including: at least one processor; and a memory storing computer instructions executable on the processor, the instructions when executed by the processor implementing method steps comprising: configuring a security level identifier for a virtual machine, and acquiring an optional host list based on the operation index of the virtual machine; traversing the selectable host list, and judging whether the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine one by one; if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine or the host in the selectable host list has no security level identification and no running virtual machine exists on the host, scheduling the virtual machine to run on the host; and responding to a received user access system request, acquiring the security level identification corresponding to the user access authority, and providing the virtual machine and host machine resources lower than the security level identification corresponding to the access authority for the user.

In some embodiments, configuring the virtual machine with the security class identification comprises: and configuring a security level identifier according to the security degree of the virtual machine, wherein the security level identifier of the virtual machine is configured to be absent by default.

In some embodiments, obtaining the list of optional hosts based on the performance metrics of the virtual machine comprises: screening optional hosts based on the operation indexes of the virtual machines, and generating an optional host list based on the optional hosts; the operation indexes comprise a memory, a CPU, a storage and a network.

In some embodiments, traversing the selectable host list further comprises: setting a global cache variable based on a host identification and a security level identification corresponding to the host, and scheduling the virtual machine through the global cache variable.

In some embodiments, determining, on an individual basis, whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines comprises: obtaining a security level identifier of a host in the selectable host list in a cache, if the security level identifier of the host does not exist in the cache, further obtaining a virtual machine which is operated on the host, and taking the security level identifier of the virtual machine which is operated on the host as the security level identifier of the host; and judging whether the security level identification of the host is consistent with the security level identification of the virtual machine.

In some embodiments, if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no virtual machine is running on the host, scheduling the virtual machine to run on the host comprises: if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine, the virtual machine is dispatched to the host to run; if the host in the selectable host list has no security level identification and no running virtual machine exists on the host, setting the security level identification of the virtual machine as the security level identification of the host, and scheduling the virtual machine to the host to run.

In some embodiments, obtaining the security level identifier corresponding to the access right of the user, and providing the virtual machine and host resource lower than the security level identifier corresponding to the access right for the user further includes: and if the user access authority is not set with the security level identification, providing the virtual machine and host machine resources with the security level identification of no for the user.

In a further aspect of the embodiments of the present invention, a computer-readable storage medium is also provided, in which a computer program for implementing the above method steps is stored when the computer program is executed by a processor.

The invention has the following beneficial technical effects: the virtual machines are divided into different security level identifications and are dispatched to the host corresponding to the security level identification during starting or load balancing dispatching, so that the virtual machines with different security level identifications are divided and isolated physically, and access control of the host and the virtual machine resources is further realized through the security level identifications of the host and the virtual machines.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of a virtual machine scheduling and secure access method provided by the present invention;

FIG. 2 is a flowchart illustrating a virtual machine scheduling and secure access method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an embodiment of a virtual machine scheduling and security access apparatus provided in the present invention;

FIG. 4 is a schematic diagram of an embodiment of a computer device provided by the present invention;

FIG. 5 is a schematic diagram of an embodiment of a computer-readable storage medium provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.

In view of the foregoing, a first aspect of the embodiments of the present invention provides an embodiment of a virtual machine scheduling and secure access method. Fig. 1 is a schematic diagram illustrating an embodiment of a virtual machine scheduling and secure access method provided by the present invention. As shown in fig. 1, the embodiment of the present invention includes the following steps:

s01, configuring a security level identifier for the virtual machine, and acquiring an optional host list based on the operation index of the virtual machine;

s02, traversing the selectable host list, and judging whether the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine one by one;

s03, if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine or the host in the selectable host list has no security level identification and no running virtual machine on the host, scheduling the virtual machine to the host to run; and

s04, responding to the received request of the user for accessing the system, obtaining the security level identification corresponding to the user access authority, and providing the virtual machine and host machine resources lower than the security level identification corresponding to the access authority for the user.

In this embodiment, the virtual machine security level identifier configuration module, the virtual machine scheduling module, and the virtual machine access control module are included in three core modules. The system comprises a virtual machine secret identifier configuration module, a security manager and a common user, wherein the shutdown virtual machine supports editing of the virtual machine secret identifier, only the security manager has the authority to edit the secret identifier, and the other devices such as a system manager, an audit manager, a common user and the like have no authority to edit; the virtual machine scheduling module firstly ensures that the virtual machine is scheduled to a host with the memory, the CPU, the storage and the network meeting the operation condition, then considers whether the security level identification is met and needs to consider the condition that a large number of virtual machines are started simultaneously, so that the situation that two virtual machines with different security level identifications run on the same host and need to set a global cache variable is avoided, the host security level identification which is successfully scheduled in the scheduling process is stored by key value pairs < host ID and security level identification >, and the security level identification scheduling process is locked, and the accuracy of the virtual machine scheduling based on the security level identification is ensured; in the scheduling, a host matched with the secret identification of the virtual machine or a host on which the virtual machine is not operated is required to be found; the virtual machine access control module is characterized in that a user role needs to set corresponding access permissions to virtual machines with different security level identifications, only a user of the role with the corresponding security level identification access permission can access and operate the virtual machine with the corresponding security level identification, a user logs in a system, when virtual machine resources are accessed, the security level identification permission of the role is judged at first, then the virtual machine with the corresponding security level identification is filtered out, the user shows, and if the role does not set the security level identification permission, only the virtual machine without the security level identification can be checked and operated.

In this embodiment, the purpose of achieving secure access to a virtual machine according to different security levels is achieved by performing security level identification classification on the virtual machine, and fig. 2 is a flowchart illustrating an embodiment of a virtual machine scheduling and secure access method provided by the present invention, and a specific implementation process shown in fig. 2 includes:

configuring a virtual machine secret level identifier, and defaulting to nothing; starting the power supplies of the virtual machines in batches; the scheduling module starts to schedule the virtual machines according to the sennity secret-level identification, and the virtual machines with different secret-level identifications run on different hosts; when scheduling, firstly obtaining a virtual machine selectable host list; traversing the optional host list, judging whether the host security level identification information exists in the cache one by one, if so, judging whether the security level identification of the host is consistent with the virtual machine, and if so, running the virtual machine on the host; if the host security level identification information does not exist in the cache, acquiring the running virtual machine on the host, taking the security level identification of the running virtual machine as the host security level identification, judging whether the security level identification of the host is consistent with the virtual machine security level identification, and if so, running the virtual machine on the host; if the host does not have the running virtual machine, the virtual machine is run on the host, and the security level identification of the virtual machine is taken as the security level identification of the host and recorded in the cache; after the scheduling of the virtual machine is finished, the user login system with roles with different security level identification access authorities is used, and the resources of the virtual machine and the host with the security level identification lower than the security level identification are filtered by matching all the security level identification authorities of the user roles, so that the security and the safety of the virtual machine and the host are well controlled.

In some embodiments of the invention, configuring the virtual machine with the security class identification comprises: and configuring a security level identifier according to the security degree of the virtual machine, wherein the security level identifier of the virtual machine is configured to be absent by default.

In some embodiments of the present invention, obtaining the optional host list based on the operation index of the virtual machine includes: screening optional hosts based on the operation indexes of the virtual machines, and generating an optional host list based on the optional hosts; the operation index comprises a memory, a CPU, a storage and a network.

In some embodiments of the invention, traversing the selectable host list further comprises: and setting a global cache variable based on the host identification and the security level identification corresponding to the host, and scheduling the virtual machine through the global cache variable.

In some embodiments of the present invention, determining whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines one by one includes: acquiring a security level identifier of a host in an optional host list in a cache, if the security level identifier of the host does not exist in the cache, further acquiring a virtual machine which is operated on the host, and taking the security level identifier of the virtual machine which is operated on the host as the security level identifier of the host; and judging whether the security level identification of the host is consistent with the security level identification of the virtual machine.

In some embodiments of the present invention, if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no running virtual machine exists on the host, the scheduling the virtual machine to the host to run includes: if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine, the virtual machine is dispatched to the host to run; and if the host in the selectable host list has no security level identification and no running virtual machine exists on the host, setting the security level identification of the virtual machine as the security level identification of the host, and scheduling the virtual machine to the host to run.

In some embodiments of the present invention, obtaining the security identifier corresponding to the access right of the user, and providing the virtual machine and the host resource lower than the security identifier corresponding to the access right for the user further includes: and if the user access authority is not set with the security level identification, providing the virtual machine and host resources with the security level identification of no for the user.

It should be particularly noted that, the steps in the embodiments of the virtual machine scheduling and secure access method described above may be mutually intersected, replaced, added, or deleted, and therefore, these reasonable permutation and combination transformations for the virtual machine scheduling and secure access method should also belong to the scope of the present invention, and should not limit the scope of the present invention to the embodiments.

In view of the above object, a second aspect of the embodiments of the present invention provides a virtual machine scheduling and security access apparatus. Fig. 3 is a schematic diagram illustrating an embodiment of a virtual machine scheduling and secure access apparatus provided in the present invention. As shown in fig. 3, an embodiment of the present invention includes the following modules: a first module S11, configured to configure a security classification identifier for a virtual machine, and obtain an optional host list based on an operation index of the virtual machine; a second module S12, configured to traverse the selectable host list, and determine whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines one by one; a third module S13, configured to schedule the virtual machine to run on the host if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no running virtual machine exists on the host; and a fourth module S14, configured to, in response to receiving a user request to access the system, obtain a security identifier corresponding to the user access right, and provide the virtual machine and host resources lower than the security identifier corresponding to the access right for the user.

In view of the above object, a third aspect of the embodiments of the present invention provides a computer device. Fig. 4 is a schematic diagram of an embodiment of a computer device provided by the present invention. As shown in fig. 4, an embodiment of the present invention includes the following means: at least one processor S21; and a memory S22, the memory S22 storing computer instructions S23 executable on the processor, the instructions when executed by the processor implementing the above method steps comprising: configuring a security level identifier for the virtual machine, and acquiring an optional host list based on the operation index of the virtual machine; traversing the selectable host list, and judging whether the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine one by one; if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine or the host in the selectable host list has no security level identification and no running virtual machine exists on the host, scheduling the virtual machine to the host to run; and responding to the received user access system request, acquiring the security level identification corresponding to the user access authority, and providing the virtual machine and host machine resources lower than the security level identification corresponding to the access authority for the user.

In some embodiments of the invention, configuring the virtual machine with the security class identification comprises: and configuring a security level identifier according to the security degree of the virtual machine, wherein the security level identifier of the virtual machine is configured to be absent by default.

In some embodiments of the present invention, obtaining the optional host list based on the operation index of the virtual machine includes: screening optional hosts based on the operation indexes of the virtual machines, and generating an optional host list based on the optional hosts; the operation index comprises a memory, a CPU, a storage and a network.

In some embodiments of the invention, traversing the selectable host list further comprises: and setting a global cache variable based on the host identification and the security level identification corresponding to the host, and scheduling the virtual machine through the global cache variable.

In some embodiments of the present invention, determining whether the security level identifiers of the hosts in the selectable host list are consistent with the security level identifiers of the virtual machines one by one includes: acquiring a security level identifier of a host in an optional host list in a cache, if the security level identifier of the host does not exist in the cache, further acquiring a virtual machine which is operated on the host, and taking the security level identifier of the virtual machine which is operated on the host as the security level identifier of the host; and judging whether the security level identification of the host is consistent with the security level identification of the virtual machine.

In some embodiments of the present invention, if the security level identifier of the host in the selectable host list is consistent with the security level identifier of the virtual machine or the host in the selectable host list has no security level identifier and no running virtual machine exists on the host, the scheduling the virtual machine to the host to run includes: if the security level identification of the host in the selectable host list is consistent with the security level identification of the virtual machine, the virtual machine is dispatched to the host to run; and if the host in the selectable host list has no security level identification and no running virtual machine exists on the host, setting the security level identification of the virtual machine as the security level identification of the host, and scheduling the virtual machine to the host to run.

In some embodiments of the present invention, obtaining the security identifier corresponding to the access right of the user, and providing the virtual machine and the host resource lower than the security identifier corresponding to the access right for the user further includes: and if the user access authority is not set with the security level identification, providing the virtual machine and host resources with the security level identification of no for the user.

The invention also provides a computer readable storage medium. FIG. 5 is a schematic diagram illustrating an embodiment of a computer-readable storage medium provided by the present invention. As shown in fig. 5, the computer readable storage medium stores S31 a computer program that, when executed by a processor, performs the method as described above S32.

Finally, it should be noted that, as one of ordinary skill in the art can appreciate that all or part of the processes of the methods of the above embodiments can be implemented by a computer program to instruct related hardware, and the program of the virtual machine scheduling and secure access method can be stored in a computer readable storage medium, and when executed, the program can include the processes of the embodiments of the methods as described above. The storage medium of the program may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like. The embodiments of the computer program may achieve the same or similar effects as any of the above-described method embodiments.

Furthermore, the methods disclosed according to embodiments of the present invention may also be implemented as a computer program executed by a processor, which may be stored in a computer-readable storage medium. Which when executed by a processor performs the above-described functions defined in the methods disclosed in embodiments of the invention.

Further, the above method steps and system elements may also be implemented using a controller and a computer readable storage medium for storing a computer program for causing the controller to implement the functions of the above steps or elements.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as software or hardware depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments of the present invention.

In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk, blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.

It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.

The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.